What Is an 8×80mm Track Spike?
A dog spike - also written hook spike or hook-headed spike - is a one-piece forged spike whose head is offset to form a hook. When driven, the hook overlaps the edge of the rail foot and presses the rail down onto the tie plate (baseplate), while the shank anchors in the timber sleeper below. This arrangement is the classic timber-sleeper fastening on light track: the tie plate spreads the wheel load over the sleeper, and the spikes at both sides of the rail foot fix its position and hold the gauge.
8×80mm hook-headed track spike used for rail-to-timber fixing.
At 8 mm shank and 80 mm length, the 8×80mm spike sits at the small end of the dog-spike range. Spikes of this size suit light-duty track where wheel loads are modest: mine sidings, quarry lines, industrial sidings, narrow-gauge and light railway lines, and crane runways laid on timber sleepers. Main-line timber track normally uses larger dog spikes, typically with square shanks of 16 mm or more, and correspondingly longer bodies. Treating an 8×80mm spike as a heavy main-line fastener would be a specification error.
Track Spike Types at a Glance
| Type | Typical sleepers | How it works | Is 8×80mm this type? |
|---|---|---|---|
| Dog spike (hook-headed spike) | Timber sleepers, light and main line | Hook head clamps the rail foot over a tie plate; plain shank is driven into the timber. | Yes. The 8×80mm spike is a light-duty dog spike. |
| Screw spike (threaded spike) | Concrete sleepers with embedded plastic dowels; also timber where pull-out resistance must be higher | Threaded shank is screwed into a dowel or a pre-drilled timber hole, giving high pull-out resistance. | No. A screw spike has a threaded body; the 8×80mm spike has a plain shank. |
| Elastic fastening systems (spring clips, not spikes) | Timber or concrete sleepers | A spring clip is pressed over the rail foot against a shoulder or cast-in part; the elastic element keeps a steady clamping load and damps vibration. | No. Elastic systems use clips and shoulders, not plain spikes. The term "elastic railroad spike" is not a standard product class. |
Typical Specifications and Materials of the 8×80mm Track Spike
| arameter | Typical value | Note |
|---|---|---|
| Shank diameter | 8 mm | Designation basis; confirm tolerance against drawing. |
| Total length | 80 mm | Designation basis. |
| Head form | Hook (offset dog head); flat head available | Hook side faces inward over the rail foot. |
| Material | Low-carbon structural steel, e.g. Q235 (typical, per GB/T 700) | Carbon steel is typical; other grades by project specification. |
| Thread | None | A threaded body would make it a screw spike. |
| Surface finish | Black oxide (blackened), electro-galvanized, or hot-dip galvanized (typical) | Hot-dip coating thickness commonly follows GB/T 13912, aligned in practice with ISO 1461. |
| Straightness / surface | Free of cracks, heavy scale and burrs | Checked by visual and dimensional sampling. |
| Packaging | Steel wire cartons, wooden cases, pallets or big bags (typical) | Per order and destination. |
Mechanical properties are generally agreed per project: a material certificate is the usual evidence for the steel grade, and coating thickness is verified by measurement on samples when specified. No hardness or tensile figures are listed here because the 8×80mm class has no single published value that would apply to every supplier's product.
Where 8×80mm Track Spikes Are Used
The 8×80mm dog spike is a practical choice wherever the track is light and the sleeper is timber. Typical applications include:
- Mine and quarry rail lines, where short trains and low speeds keep wheel loads modest.
- Narrow-gauge and light railway track, including industrial sidings and works railways.
- Timber-sleeper sections of port and warehouse track, and crane runways laid on timber.
- Temporary track and construction railways, where simple tool-only installation is an advantage.
The short 80 mm shank also makes the spike suitable for sleeper sections of reduced thickness. For permanent main-line track, or for any concrete sleeper, this size is not the right tool: concrete sleepers need screw spikes working with embedded plastic dowels, and heavy timber track needs larger dog spikes or spring-clip fastening systems.
How to Install an 8×80mm Track Spike
Installation is a standard timber-track operation. The steps below reflect common practice and typical tools:
Tools for the job
A drill with a bit roughly 6–7 mm in diameter, a hammer or pneumatic spike driver, a gauge for checking track spacing, and, where available, a driving guide to keep the spike vertical.
Position the tie plate. Place the tie plate (baseplate) on the sleeper at the marked sleeper position, then set the rail in gauge on the plate.
Drill a pilot hole. Drill into the timber through the plate holes, using a bit slightly smaller than the 8 mm shank - roughly 6–7 mm is typical - to reduce the risk of splitting the sleeper and to make driving easier.
Set the spike. Put the spike in the hole with the hook head facing inward, so the hook will overlap the edge of the rail foot when driven.
Drive the spike. Seat it with a hammer, then drive fully with a hammer or pneumatic spike driver. Keep the spike perpendicular to the sleeper so the hook lands squarely on the rail foot.
Check the result. The hook must bear on the rail foot without crushing the timber, and the rail must stay on the plate seat. Avoid over-driving, which damages the timber and loosens the holding force.
Re-check after service. On light track, inspect spikes again after the first days of traffic and after heavy rain; re-drive or replace any that have worked loose.
Quality Checks and Coating Considerations
Two points decide whether a batch of spikes performs as expected: the steel grade and the protective coating. The material is usually confirmed by the steel grade certificate. Q235, a common low-carbon structural steel, is defined in GB/T 700, the Chinese standard for carbon structural steels; equivalent grades exist in other national systems, so the grade should be agreed against the project specification rather than assumed.
For corrosion protection, hot-dip galvanizing is the most common choice on outdoor and humid track. Coating requirements for hot-dip galvanized steel parts in China are laid down in GB/T 13912, which in practice aligns with ISO 1461; specifying either standard in the purchase document gives the supplier a measurable target. Black oxide is an economical finish for indoor or dry applications but offers only light corrosion protection, so it is rarely specified where track is exposed to weather.
Incoming inspection of a delivered lot typically covers shank diameter and length against the drawing, head form, straightness, surface condition (no cracks, heavy scale or burrs), and coating thickness on a sample basis. Keeping this check list in the order documents prevents disputes and keeps replacement cost low.
What to check on delivery
Sample a small portion of each lot: measure shank diameter and length with a caliper, check the hook geometry against the drawing, and confirm coating thickness where galvanizing is specified. Any deviation should be reported against the agreed standard rather than accepted by eye.
Frequently Asked Questions
Q1. Is the 8×80mm track spike a dog spike or a screw spike?
It is a dog spike (hook-headed spike). It has a plain 8 mm shank and an offset hook head; it carries no thread. A screw spike, by contrast, has a threaded body and is turned into a dowel or pre-drilled hole.
Q2. Which sleepers can an 8×80mm track spike be used with?
Timber sleepers, in light-duty applications such as mine lines, narrow-gauge track, industrial sidings and timber-sleeper crane runways. It is not designed for concrete sleepers.
Q3. What material and finish are typical for an 8×80mm track spike?
Low-carbon structural steel such as Q235 (per GB/T 700) is typical. Common finishes are black oxide, electro-galvanizing, or hot-dip galvanizing per GB/T 13912 / ISO 1461. These are typical values; the order drawing is the authority.
Q4. How is an 8×80mm track spike installed?
Drill a pilot hole slightly smaller than the shank (roughly 6–7 mm is typical), set the spike with the hook facing the rail foot, and drive it with a hammer or pneumatic driver. Check that the hook bears on the rail foot without over-driving.
Q5. Can an 8×80mm track spike be used on concrete sleepers?
No. Concrete sleepers require screw spikes threaded into embedded plastic dowels, or spring-clip fastening systems with cast-in shoulders. A plain dog spike has no way to anchor in concrete.
